That is the maximum range of punishment for a class A misdemeanor (1 year in jail and/or a fine not to exceed $1,000.00). Many times, tickets of this nature can be resolved without points being assessed against your driving record. I don't ever recall seeing a sentence with jail time being executed on any cases similar to the one you described.
If either the prosecutor or the defense attorney invokes the rule on witnesses, you will not be allowed in the courtroom unless you are the defendant. If you are the defendant, you should be allowed in the courtroom.
Yes and you may be charged later depending on what you mean by you and her got into it. Please DO NOT post any details here but talk with a local attorney as soon as possible. Just because you were released does not mean they won't charge you later.
Contact a local attorney as soon as possible. If you have been subpoenaed to testify, you will need to show up or there could be dire consequences. You need consult a local attorney so you will know your rights.